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raddevus
  • Member for 9 years, 9 months
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34 votes
13 answers
50k views

How can I make connection on pcb (circuit board) holes without solder (for prototyping)?

15 votes
4 answers
3k views

Is there a gap in an LED between the plates (post & anvil) or a wire (or are there different kinds of each)?

8 votes
3 answers
2k views

Why is my circuit's current far lower than expected with 2.6v / 220Ohm / and LED?

8 votes
1 answer
915 views

Why do these capacitors have an additional plastic block around them? What kind of capacitor is this?

6 votes
3 answers
8k views

Can this transistor (2N2222) take 6 V on emitter-base? Am I reading the datasheet incorrectly?

4 votes
1 answer
593 views

Is it possible to use a NPN BJT as switch, from single power source?

3 votes
4 answers
3k views

Multimeter, measuring current calculates less. Can I calculate meter's internal resistance this way?

2 votes
2 answers
1k views

How is it possible to ever have frequency on a DC circuit?

2 votes
1 answer
4k views

When I write data to a BLE Characteristic (FFE1) to send data over bluetooth, is the data encrypted?

2 votes
4 answers
3k views

What are some reasons my atmega32u4 loses program when disconnected from power?

2 votes
3 answers
14k views

LM358n versus LM386 for audio amp

1 vote
0 answers
728 views

Should I be able to replace the BC547 with a 2N2222A in this circuit?

1 vote
1 answer
143 views

Why am I getting such widely ranging values from this TMP36 in this circuit?

1 vote
1 answer
617 views

Using Kicad & proper part symbols: How do I add these types of parts for through-hole PCB?

1 vote
1 answer
377 views

Kicad: Are these traces all connected (if on same layer)?

1 vote
1 answer
7k views

How can I fix Atmel Studio 7 install which is stuck on "initializing environment"? [closed]

1 vote
6 answers
14k views

Attempt to use 2n2222 as a switch, but it seems to work below 5v (all the way down to < 1v). Why?

1 vote
0 answers
526 views

Can I replace electret microphone with audio connector and expect similar results (sound levels)?

1 vote
2 answers
3k views

How can I use a transistor (2n2222) to act as a switch with this 12V momentary switch? [closed]

1 vote
1 answer
307 views

Does this schematic represent the fritzing circuit properly and can you explain how pulled low works in this IR sensor?

0 votes
3 answers
395 views

How are size of caps determined/calculated for use in smoothing voltage?

0 votes
1 answer
343 views

Why do my led bulbs state: not for use in totally enclosed luminaries?

0 votes
3 answers
1k views

Can rechargeable batteries with different mA values be used in the same device with good/normal results?

0 votes
2 answers
120 views

With power only on this LCD, will I see anything?

0 votes
1 answer
786 views

How do I drive pin 2 on my 555 IC low so the one-shot timer will fire, using an IR sensor in place of my pushbutton switch?

0 votes
1 answer
399 views

Can a small voltage represent a closed circuit? [closed]

0 votes
1 answer
428 views

When an HC-05 Bluetooth module receives data via wireless does it write it to receive (Rx) pin or transmit (Tx) pin?

0 votes
3 answers
2k views

Using 2N2222 to generate noise - how would I make frequency lower / change frequency?

0 votes
2 answers
210 views

What is max input voltage on ATMega4809 (datasheet versus Atmel-ICE programmer)?

0 votes
4 answers
475 views

How do I (can I) replace the relay in this circuit with a transistor?